A tunable XUV monochromatic light source based on the time preserving grating selection of high-order harmonic generation

Niu Yong^{1, 2}, Liang Hongjing^{1, 2}, Liu Yi^{1, 2}, Liu Fangyuan^{1, 2}, Ma Ri^{1, 2, †}, Ding Dajun^{1, 2, ‡}

(a) The harmonic spectrum generated by Ar is recorded by scanning the azimuth angle of the grating with 300 gr/mm. (b) The harmonic spectrum generated by Ne is recorded by scanning the angle of the grating with 600 gr/mm, and the intensity of the single-order HHG radiation is recorded by using a calibrated XUV diode behind the exit slit. The dashed line indicates the absorption edge of Al filter.